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Finding the Fourth Proportional to 21,907.80, 32,879.28 and 11,380.92

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Solution

The fourth proportional to 21,907.80, 32,879.28 and 11,380.92 is: 17,080.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,907.80 : 32,879.28 = 11,380.92 : x
  2. Step 2: Convert to fraction form
    21,907.80/32,879.28 = 11,380.92/x
  3. Step 3: Cross multiply
    21,907.80x = 32,879.28 × 11,380.92
  4. Step 4: Simplify right side
    21,907.80x = 374,196,455.34
  5. Step 5: Solve for x
    x = 374,196,455.34/21,907.80
  6. Step 6: Final answer
    x = 17,080.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.